Electrical plug socket



Sept. 21 1926.

1.. PRO PP ELECTRICAL PLUG SOCKET Filed Nov; 14. 1921 11v VENTOR 400/5 7 1F05 ATTORNEY Patented Sept. 21, T926.

UNITED STATES 1,600,564 PATENT OFFICE.

LOUIS PROPP, OF NEW YORK, N. Y.

ELECTRICAL I Application filed November This invention relates to electric plug sockets. More particularly, it is directed to a plug socket of the cluster type adapted for use with a plurality of electrical appliances.

One of the objects of the invention is to provide a device of the character described which shall be simple and compact in construction, comparativelycheap to manufacture and efiicient in operation to a high de ree.

ther objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combinations of elements and arrangement of parts which will be exemplified in the construction hereinafter described and of which the scope of application will be indicated in the following claim. 1

In the accompanying drawings, in which is shown one of the various possible illus trative embodiments of this invention,

Fig. 1 is a front elevation of the device adapted for use with two electric lamps or appliances;

Fig. 2 ,is a longitudinal cross-section I thereof; and

Fig. 3 is a section out along line 3-3 of Fig. 2.

Referring in detail to the drawing, the embodiment of my invention there shown comprises an outer casing 10of insulatory material such as composition or hard rubber, having a plug portion 11 exteriorly threaded as at 12 and integral socket portions 13 "and 13'. An opening 14 disposed centrally in the plug portion 11 communicates with each of the socket portions by means of the interior channel 15 for the purpose hereinafter described. Threadedon the plug portion 11 is the screw contact shell 16 having a central contact cap 17 suitably insulated from the shell as bymeans of the insulation 18. A central opening 19 is provided in the cap for aiding and making the electrical connections. Similarly constructed threaded metallic screw shells 20, 20 are provided for each of the socket portions 13, 13 and are rigidly held therein. In practice, the casing is preferably formed to the desired shape by casting the insulating material in a mold or by any PLUG SOCKET.

14, 1921. Serial No. 514,910.-'

shells each having the flexible lead wires I attached thereto as hereinafter described are then inserted into the socket portions 13, 13 and the wires drawn through the opening 14 via the channel 15. The metallic screw shells are then adjusted to the proper position and rigidly secured to the interior of the casing. This may be done by expanding the casing with heat and allowing the latter to contract on the metallic screw shells,-or any other suitable practice may be employed.

Each of the threaded metallic screw shells 20, 20 comprises a threaded contact portion 21, and a central contact cap 22 suitably insulated therefrom, and isconnected in multiple with the plug contact shell 16 in any suitable manner. Preferably, a pair of insulated flexible lead wires 23, 23 are connected respectively to the threaded portion 21 and the central contact cap 22 of the shell 20. Similarly, another pair of flexible lead wires 24, 24 are connected respectively to the contact portion 21 and the cap 22' of the shell 20'.

Lead wires 23, 24 and 23', 24 from like terminals of each shell are then connected to the plug portion 10 respectively to the screw contact shell 16 and the central contact cap 17 thereof. Each pair of like flexible lead wires 23, 24, and 23, 24 are drawn through the channel 15 and opening 14. One pair of lead wires such as 23, 24 are then bent over the top 26 of the plug portion 11 and .forced into one of the grooves 25, 25, disposed diametrically opposite each other on the exterior face of the plug portions; The screw contact shell 16 is then screwed on the plug portion, the lead wires 23, '24' passing through the central opening 19. The pairgfot like wires are then connected electrically to being those commonl in use in connection with plug sockets. y making the connection between the'socket portions and plug portions through flexible leads, it is possible to make the casing in one piece as described and yet assemble the screw shells in the socket portions and make the connections therefrom to the plug with the completed casing. This is not possible where the connectionsbetween the socket portions of the plug are made through rigid metallic members around which the insulating casing would have to be poured. I It will thus be seen that there is provided a device in which the several objects of this invention are achieved and which is well adapted to meet the conditions of practical use. a

As various possible embodiments might be made of the above invention and as various changes might ,be made in the embodiment above set forth, it is to'be understood that all matter herein, set forth or shown in i the accompanying drawings is tobe interpreted as illustrative and not in alimiting sense. a

Having thus described my invention, I claim as new and desire to secure by'Letters Patent An electric plugsocket comprising a onepiece' insulating casing having a plug portion, a plurality of socket portions having metal screw shells shrunk therein, said plug portion having a centrall disposed opening therein and said casing aving an interior channel disposed below said opening andcommunicating with each of said socket portions, metallic contact members for said plug portion comprising a contact shell and a contact cap insulated therefrom and havbetween said plug portion-and said socket portion.

ture.

LOUIS rRorP.

In testimony whereof I afiix my signa- 

